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billdwhite
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A Pen by Bill White.
<script src="https://d3js.org/d3.v3.min.js"></script> <h5 class="title">Use mousewheel to zoom. Drag image or minimap rectangle to pan.</h5> <button id="addButton">Add Circle</button> <div id="canvas"></div>
Modified
http://d3js.org/d3.v3.min.js
to a secure url
https://d3js.org/d3.v3.min.js